Freon refilling apparatus for vehicles

Abstract

The present Freon refilling apparatus for vehicles comprises a tube fitting and a refilling duct. The tube fitting is connected to the refilling duct. The lower end of the tube fitting has a connection port to connect with gas cylinders. A pushrod is movably inserted into the tube fitting in its axial direction. Between the tube fitting and the upper end of the pushrod, there is an operating mechanism which can push the pushrod down to the lower end of the tube fitting. When the pushrod moves downwards, its lower end can make the gas cylinder connected to the tube fitting. The present Freon refilling apparatus for vehicles is applicable to different types of gas cylinders storing Freon. This provides a more convenient way to refill Freon for automobile air conditioners, with a lower cost.

What is claimed is: 
     
       1. A Freon refilling apparatus for vehicles comprising:
 a tube fitting ( 3 ) with a connection part ( 34 ); 
 a refilling duct ( 4 ) capable of connecting to automobile air conditioners, the tube fitting ( 3 ) connected to the refilling duct ( 4 ); 
 a lower end of the tube fitting ( 3 ) with a connection port ( 353 ) capable of connecting with gas cylinder; 
 a pushrod ( 5 ) movably inserted into the tube fitting ( 3 ) in an axial direction; 
 an operating handle ( 61 ) with a push part ( 62 ) capable of pushing the pushrod ( 5 ) down to the lower end of the tube fitting ( 3 ); and 
 a confining plate ( 612 ) hinged to the operating handle ( 61 ) capable of locking the operating handle ( 61 ); 
 wherein when the pushrod ( 5 ) moves downwards, a lower end of the pushrod ( 5 ) causes the gas cylinder to connect with the tube fitting ( 3 ); and 
 wherein a first end of the operating handle ( 61 ) is hinged to the connection part ( 34 ), a second end is bent to a side of the tube fitting ( 3 ), there is an active push slope ( 63 ) on the push part ( 62 ) and the active push slope ( 63 ) is an oblique plane, an upper end of the pushrod ( 5 ) stretches out of the tube fitting ( 3 ), there is a passive push slope ( 53 ) on the upper end of the pushrod ( 5 ) and the passive push slope ( 53 ) is an oblique plane, and the active push slope ( 63 ) presses against the passive push slope ( 53 ) to form plane contact when the confining plate ( 612 ) locks the operating handle ( 61 ). 
 
     
     
       2. The Freon refilling apparatus for vehicles of  claim 1  wherein the lower end of the pushrod ( 5 ) is acute, there is an air passage hole ( 57 ) designed at the lower end of the pushrod ( 5 ), there is a vent hole ( 58 ) designed at a side wall of the pushrod ( 5 ), and the vent hole ( 58 ) is connected to an upper end of the air passage hole ( 57 ). 
     
     
       3. The Freon refilling apparatus for vehicles as claimed in  claim 2  wherein the lower end of the pushrod ( 5 ) is a slope structure. 
     
     
       4. The Freon refilling apparatus for vehicles of  claim 1  wherein there is a sealing cone ( 38 ) on an inside wall of the tube fitting ( 3 ), the sealing cone ( 38 ) is located between the refilling duct ( 4 ) and the connection port ( 353 ), a big end ( 381 ) of the sealing cone ( 38 ) is facing downward, an annular sealing block ( 54 ) is secured to the pushrod ( 5 ), a reset spring ( 55 ) is installed over the pushrod ( 5 ), a first end of the reset spring ( 551 ) presses against the tube fitting ( 3 ), a second end of the reset spring ( 552 ) presses against the pushrod ( 5 ), and when the pushrod ( 5 ) is no longer subjected to a force from the operating handle ( 61 ), the pushrod ( 5 ) is reset under a force from the reset spring ( 55 ) and drives the sealing block ( 54 ) to press against the sealing cone ( 38 ). 
     
     
       5. The Freon refilling apparatus for vehicles of  claim 4  wherein from top to bottom, the tube fitting ( 3 ) consecutively comprises a guide segment ( 31 ), a block segment ( 32 ) and a connection segment ( 33 );
 wherein a first inner diameter ( 321 ) of the block segment ( 32 ) is bigger than a second inner diameter ( 311 ) of the guide segment ( 31 ); and 
 wherein in between the block segment ( 32 ) and the guide segment ( 31 ), the sealing cone ( 38 ) is formed. 
 
     
     
       6. The Freon refilling apparatus for vehicles of  claim 5  wherein an annular sealing groove ( 51 ) is designed on an outer wall of the pushrod ( 5 ) in a circumferential direction, a sealing ring ( 52 ) is installed in the annular sealing groove ( 51 ), and the sealing ring ( 52 ) presses against an inner wall of the guide segment ( 31 ). 
     
     
       7. The Freon refilling apparatus for vehicles of  claim 5  wherein there is an air passage clearance ( 37 ) between an outer wall of the pushrod ( 5 ) and an inner wall of the guide segment ( 31 ), the air passage clearance ( 37 ) is connected to the block segment ( 32 ), there is radially a tube-connecting part ( 39 ) on an outer wall of the tube fitting ( 3 ), the tube-connecting part ( 39 ) is connected to the air passage clearance ( 37 ), and an end of the refilling duct ( 4 ) is secured on the tube-connecting part ( 39 ). 
     
     
       8. The Freon refilling apparatus for vehicles of  claim 1  wherein an exterior of the tube fitting ( 3 ) is secured with an outer shell ( 7 ), a first avoidance opening ( 71 ) is designed on the outer shell ( 7 ), a free end of the operating handle ( 61 ) passes through the first avoidance opening ( 71 ), a second avoidance opening ( 611 ) is designed on the operating handle ( 61 ), the refilling duct ( 4 ) passes through the second avoidance opening ( 611 ) and the first avoidance opening ( 71 ), a confining cavity ( 613 ) is designed at an edge on a free end of the confining plate ( 612 ) in a lengthwise direction, an edge of the first avoidance opening ( 71 ) that is next to the tube fitting ( 3 ) is a confining edge ( 72 ), and the confining cavity ( 613 ) of the confining plate ( 612 ) is capable of clamping on the confining edge ( 72 ). 
     
     
       9. The Freon refilling apparatus for vehicles of  claim 5  wherein a connection bushing ( 35 ) is secured inside the connection segment ( 33 ), an inner wall of the connection bushing ( 35 ) has an upper threaded segment ( 351 ) and a lower threaded segment ( 352 ), the connection port ( 353 ) is the lower threaded segment ( 352 ), a confining bushing ( 36 ) is screwed into the upper threaded segment ( 351 ), and an inner diameter of the confining bushing ( 36 ) is less than that of the block segment ( 32 ), an end of the reset spring ( 55 ) presses against an end face of the confining bushing ( 36 ), a sealing washer ( 361 ) is secured to the connection bushing ( 35 ) between the upper threaded segment ( 351 ) and the lower threaded segment ( 352 ). 
     
     
       10. The Freon refilling apparatus for vehicles of  claim 2  wherein there is a sealing cone ( 38 ) on an inside wall of the tube fitting ( 3 ), the sealing cone ( 38 ) is located between the refilling duct ( 4 ) and the connection port ( 353 ), a big end ( 381 ) of the sealing cone ( 38 ) is facing downward, an annular sealing block ( 54 ) is secured to the pushrod ( 5 ), a reset spring ( 55 ) is installed over the pushrod ( 5 ), a first end of the reset spring ( 551 ) presses against the tube fitting ( 3 ), a second end of the reset spring ( 552 ) presses against the pushrod ( 5 ), and when the pushrod ( 5 ) is no longer subjected to a force from the operating handle ( 61 ), the pushrod ( 5 ) is reset under a force from the reset spring ( 55 ) and drives the sealing block ( 54 ) to press against the sealing cone ( 38 ). 
     
     
       11. The Freon refilling apparatus for vehicles of  claim 10  wherein from top to bottom, the tube fitting ( 3 ) consecutively comprises a guide segment ( 31 ), a block segment ( 32 ) and a connection segment ( 33 );
 wherein a first inner diameter ( 321 ) of the block segment ( 32 ) is bigger than a second inner diameter ( 311 ) of the guide segment ( 31 ); and 
 wherein in between the block segment ( 32 ) and the guide segment ( 31 ), the sealing cone ( 38 ) is formed. 
 
     
     
       12. The Freon refilling apparatus for vehicles of  claim 11  wherein an annular sealing groove ( 51 ) is designed on an outer wall of the pushrod ( 5 ) in a circumferential direction, a sealing ring ( 52 ) is installed in the annular sealing groove ( 51 ), and the sealing ring ( 52 ) presses against an inner wall of the guide segment ( 31 ). 
     
     
       13. The Freon refilling apparatus for vehicles of  claim 11  wherein there is an air passage clearance ( 37 ) between an outer wall of the pushrod ( 5 ) and an inner wall of the guide segment ( 31 ), the air passage clearance ( 37 ) is connected to the block segment ( 32 ), there is radially a tube-connecting part ( 39 ) on an outer wall of the tube fitting ( 3 ), the tube-connecting part ( 39 ) is connected to the air passage clearance ( 37 ), and an end of the refilling duct ( 4 ) is secured on the tube-connecting part ( 39 ). 
     
     
       14. The Freon refilling apparatus for vehicles of  claim 3  wherein there is a sealing cone ( 38 ) on an inside wall of the tube fitting ( 3 ), the sealing cone ( 38 ) is located between the refilling duct ( 4 ) and the connection port ( 353 ), a big end ( 381 ) of the sealing cone ( 38 ) is facing downward, an annular sealing block ( 54 ) is secured to the pushrod ( 5 ), a reset spring ( 55 ) is installed over the pushrod ( 5 ), a first end of the reset spring ( 551 ) presses against the tube fitting ( 3 ), a second end of the reset spring ( 552 ) presses against the pushrod ( 5 ), and when the pushrod ( 5 ) is no longer subjected to a force from the operating handle ( 61 ), the pushrod ( 5 ) is reset under a force from the reset spring ( 55 ) and drives the sealing block ( 54 ) to press against the sealing cone ( 38 ). 
     
     
       15. The Freon refilling apparatus for vehicles of  claim 14  wherein from top to bottom, the tube fitting ( 3 ) consecutively comprises a guide segment ( 31 ), a block segment ( 32 ) and a connection segment ( 33 );
 wherein a first inner diameter ( 321 ) of the block segment ( 32 ) is bigger than a second inner diameter ( 311 ) of the guide segment ( 31 ); and 
 wherein in between the block segment ( 32 ) and the guide segment ( 31 ), the sealing cone ( 38 ) is formed. 
 
     
     
       16. The Freon refilling apparatus for vehicles of  claim 15  wherein an annular sealing groove ( 51 ) is designed on an outer wall of the pushrod ( 5 ) in a circumferential direction, a sealing ring ( 52 ) is installed in the annular sealing groove ( 51 ), and the sealing ring ( 52 ) presses against an inner wall of the guide segment ( 31 ). 
     
     
       17. The Freon refilling apparatus for vehicles of  claim 15  wherein there is an air passage clearance ( 37 ) between an outer wall of the pushrod ( 5 ) and an inner wall of the guide segment ( 31 ), the air passage clearance ( 37 ) is connected to the block segment ( 32 ), there is radially a tube-connecting part ( 39 ) on an outer wall of the tube fitting ( 3 ), the tube-connecting part ( 39 ) is connected to the air passage clearance ( 37 ), and an end of the refilling duct ( 4 ) is secured on the tube-connecting part ( 39 ).